Cases and possible round 4?

Hi Audio Moth, After trialing your devices I would like to now order 75 but I really need them with the case that was going to be made due to working in the tropics. Has this case been made and if not do you know when it will be made? I will need the devices in my hands in September so do you think there will be a round 4 soon after number 3? I have also run out of the small plastic bags, do you recommend a bag that we can purchase in the shops?

Thanks

Jenna